/*
 * Copyright (c) 2010, German Buela
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * The name of German Buela may not be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY GERMAN BUELA "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL GERMAN BUELA BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.gbuela.winco.business

import com.gbuela.winco.system.DriveMapping
import com.gbuela.winco.system.OS

class LocationTranslator(val drives:List[DriveMapping], val os:OS) {
  def toLogicalLocation(loc:String):String = loc match {
    case null => loc
    case s if s.length == 0 => loc
    case s => replaceStart(s, isPhysicalDrive(s), toLogical) 
  }
 
  def toPhysicalLocation(loc:String):String = loc match {
    case null => loc
    case s if s.length == 0 => loc
    case s => if (!s.startsWith("$")) s;  else {
      replaceStart(s, isLogicalDrive(s), toPhysical)
    }
  }
  
  private def isLogicalDrive(loc:String)(dm:DriveMapping) = loc startsWith dm.id
  private def isPhysicalDrive(loc:String)(dm:DriveMapping) = loc.toLowerCase startsWith dm.mapping(os)
  
  private def toPhysical(dm:DriveMapping, loc:String):String = dm.mapping(os) + loc.substring(dm.id.length)
  
  private def toLogical(dm:DriveMapping, loc:String):String = dm.id + loc.substring(dm.mapping(os).length)
  
  private def replaceStart(loc:String, pred: DriveMapping => Boolean, translate: (DriveMapping,String) => String) : String = {
    val opDrive = drives find pred
    opDrive match {
      case None => loc
      case Some(dm) => translate(dm, loc)
    }
  }
  
}
